Match the following:Part A1. the reaction of a substance with oxygen, releasing heat energy and/or light 2. a process during which waste gases are expelled from an engine cylinder 3. the combustion process as it occurs outside the engine 4. a process that draws fuel mixture into an engine cylinder 5. an engine process during which fuel ignites and product gases push against the piston 6. a process that pressurizes the fuel mixture in an enginePart Ba. combustion b. compression stroke c. exhaust stroke d. external combustione. intake strokef. power stroke

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.